Lifting-jack.



H. U. MANNY.

LIFTIN G JACK. APPLICATION FILED JULY 12, 1911.

Patented 111.21 1916 mm w i MOT/MM) one) HENRY o. MANNY, or Gears non,rnnnarnveitra.

merino-alien.

intimate.

Specification of Letters Patent.

' "Patented Jan. 231, H313.

- Application filed. July 12, 1911. Serial No. 633,145.

To all whom it may concern:

lie it known that 1, HENRY C. MANNY, a citizen of the United States,residing at Grays Run, in the county of Lycomin and State ofPennsylvania, have invente certain new and useful Improvements in Lifting-Jaclts, of which theiollowingis a specification.

This invention relates to lifting jacks, and the principal object of thesame is to provide simple means whereby adjustments are facilitated, andalso for locking the parts of the jack in their adjusted position.

Preferred and practical embodiments of the invention are shown in theaccompanying drawings, wherein- I Figure 1 is perspective view of theimproved jack. Fig. 2 is acentral vertical sectional view. Fig, 8 is ahorizontal sectional opening and eccentr cally cut rior of the support41 view.

Like references designate corresponding parts in the several figures ofthe drawings. The improved lifting jack comprises a tubular support 4having an enlarged beset, and at one portion of its upper edge isprovided with a laterally projecting boss 6 through whichanopening 7 isformed, said opening communicating at an intermediate point with theinterior of the support. acent one end, a key opening 8 is formedthrough the boss 6 and intersects the opening Y. A locking bolt 9 isrotatable in the 7, and has a portion longitudinally away, as indicatedat 10, to conform to the curvature of the interior of the sup )ort. Thebolt 9 is provided with a circuin' erential groove 11 that is 111alinement with opening 8, and a key 12 extends through opening 8 andengages groove 11 to prevent the bolt 9 having longitudinal movement inopening 7. Also the'bolt 9 has an enlarged head 12, thatprojects beyondone end of the boss and is provided with-a transverse opening in whichan operating handle 13 is loosely m unted. The other end of the bolt 9is flush with the adjacent end ofhoss 6, and the said adjacent ends areprovided with indicators or marks, 14 and 15 to designate the positionof the cut-away portion 10 of said bolt relative to the inte- Internallythe support t isprovided with a longitudinally arranged guiding Ivertically movable in the support 4, and is provided with externallongitmiinally extending groove 'icfvvith which therih 16 threaded,an

Ad- I rib 16. A hollow post 17 is n support, afpost longitudinal"therein and'provided witlrregu l 5 locking bolt interlocks to preventrelative rotation of the support and post. Externally the post 17 isprovided with regularly spaced transverse keeper grooves 19 which areadapted to be selectively engaged, by bolt 9 to look the post againstlongitudinal movement relative to said post, The post 17 is internallyThe'work-holder is provi ed uponwhich a the externallvthreaded shank 20of a work support 21 adjustably enga as The rest 23 is i that preventswork slipping. The support 21 is provided with intersecting openings 24through which the operating bar 25 extends. It will be clear from thetore oing that by rotating the eccentric locking olt 9 to present itsnotched orcut-away rtion 10 to the interior of the support 4:, t e post17 can be moved vertically, and. by rotatin said bolt to present itsfull rounde side Within the support, the same will engage one ofthegrooves 19 and thereby lock the post against vertical movement. thelocking of the post 17 indication marks 26 are provided thereon to show'Whenthe grooves 19 are in osition to be engaged y the solid part of tebolt 9. .f

It will be seen that this invention prothe To facilitate vides meanswhereby the work can be I tated while supported, and that two distinctadjustments may be obtained, one by adjusting the post 17 relative tothe support-4,

and the other by adjusting the work'support 21 relative to said post.

What {claim as my invention is 1. A lifting jack comprising a hollowsupport having a boss provided with an o ening which communicates withthe inter1ortof the support, a locking bolt rotatable in said openingand provided with a notched portion, a post verticall movable insaidsupport and, slidably interlocked therewith to prevent rotarymovement of said post, regularly sp'aced transverse grooves being formedin said post that are selectively engaged by said bolt to preventlongitudinal movement thereof, a work support adjustably'connected tosaid post, and

means for rotating the locking bolt. 2. A lifting jack comprisi g amovable 'lZrly spaced transverse grooves, an ecoelit; e"

hollow x extending transyersely through one'side of the upper portion ofsaid support and adapted to scloctivelyengage said groovm: to preventvertical movement of said post,

means for rotating said bolt, and Work supporting means carried by saidpost.

3. A lifting Jack comprising a lmse support provided with a boss, 21lot-king bolt i-ovent longitudinal movement in the bolt, a i

post longitudinally movable in the support i nnd provided with meansadapted to be enganged by said bolt to prevent longitudinal j movementof said post means for rotating 2 said bolt, and Work SHIZpOl'tIng meanscarried by said. ost.

#1. A lifting jack oompli 'ing n hollow support, an eccentric lookingbolt (attending trunsvorsely across tho upper portion thereof, a postlongitudinally zuljuntubh: in said sl'l'pport and provide-d withgrooms-(hut are engaged by said bolt to lock tho post to said support,said bolt and the oppor portion of tho support being y'n'ovid d withcoopoinh ing moans to indicate the position of said bolt Ielntivge totho grooves of tho post and work supporting moans adjustably connectedto the post.

In testimony whereof I hereunto aflix my signature in the prosonoo oftwo Witnesses). HENRY C. MANNY. \Vitnesses:

.l'onx C. Rooms, Cnnsmn F. HALL.

